How to wind a 22µH coil ?

[yasir_ali86]

Hello Guys! i am just stuck on how to wind a coil. like i am have to wind a 22µH coil. so how to wind that?

i have read many books on how to wind the coil. A book told me a formula that L=N²µA/ l,
where;
L=Inductance in Henry(H)
N= number of turns of wire
µ=it is the permeability in Henry per meter (H/m)
A=it is the area cross-sectional area in meter square and
l= it is the core length in meter.

i don't know how to choose N,L,µ,A and l AND what gauge size wire i have to use, so that when i wind the wire according to that i must have the required Inductance.? please help me wind a 22µH coil. and plus tell me that if there is any way to check that what i wind a coil, has what amount of Inductance. mean How can i measure the inductance of the coil?

Thanks

 

[FvM]

coil help

The formula is valid for an inductor with a core and closed magnetical path. Did you already choose a core?
If so, you most likely get an Al value with the data, that eases the inductance calculation.

You'll also find various empirical formulas respectivels rules of thumb for "air core" inductors.

Except for intended inductance, current, frequency range or acceptable size are important design parameters.

 

[yasir_ali86]

Re: coil help

No. i did not choose the core yet because, I am not known of on what assumptions to choose the core to be air,iron or so ever.
i need 22µH inductance coil. i am attaching my circuit where i need the coil. then tell me how to choose core and get the other parameters to have the coil of 22µH.

Thanks

 

[FvM]

Re: coil help

For an oscillator, stable inductance is typically demanded. 22 uH suggests an open path ferrite core respectively a closed core with
an air gap. You can buy fixed 22 uH inductors from a catalog distributor or electronics DIY shop.

For building your own inductor, ferrite cores are available in various shapes and sizes. Because it's a signal application without
any power requirements, the smallest available (or manageable) size will fit.

 

[yasir_ali86]

Re: coil help

@FvM you got my point How to choose the values i asked above and i got it that it is our experience that tells us that what type of core to be use. like in radio application we normally use a ferrite core. am i right?

 

[IanP]

Re: coil help

An off-the-shelf 22uH rf choke will cost you less than any ferrite core and a piece of copper wire .. I wouldn’t bother ..
RF chokes are very popular and readily available ..
http://electronics.max-superstore.com/choke-axial-conformal-22uh

Rgds,
IanP

 

[yasir_ali86]

Re: coil help

@IanP
tell that now i have wound the inductor with copper wire. is there any meter that can calculate the inductance of the coil?